They are just roof top tents, fits anything with cross bars. 2 of the more common manufactures are Tepui and CVT (Cascadia Vehicle tents). I have seen them on a Honda Civic and a Subie wagon once. They have different sizes, options, etc. I personally like the extended vestibule ones (the ones that cover the ladder and one door). So that if you are in blowing rain or snow, when you open the door to get out you are not dealing with moisture ingress. I also like the stronger floor models. The thinner floor ones weigh less but get dents/ dings easily, so be it will likely not interfere with the use of the tent. The ruggedized Tepui (or CVT summit series) models have diamond plate for the outer shell so if tree limbs etc smack it you are just that better off protected.
These upgraded models also have anti condensation mats to prevent wet mattress from moisture build up as well as covered interior poles that do the same when you seal the tent up. All these little things add up to more cost and weight. But its up to you to do your own research.
Also on wrangers, since you do not have cross bars or racks, you will need to pick one of the aftermarket rack that externally span your top. Gobi/ Baja/ and Garvin are the most common. I have a Gobi rack on my X and its the best thing I added to it. I use it to hold my light bar, my rear lights, my hi lift, shovel, axe, and a 5lb propane tank held with a powertank bracket and fourtreks mounts, it is very versatile. And now my tent. Even with the tent up there, all this still fits. I use to also store 6 gallons of fuel and 2 gallons of water on rotopax up there, but have a new rear bumper inbound that hold 2 5 gallon jerry cans. So I need more I can put the rotopax on for a trip. Again, all you need is cross bars, so later if you get something else, your still good to go with these. Just up out of the mud. Snow. Crap and its awesome. I have taken mine up American fork canyon over easter and learned a bit about it. For instance, my X is 81" tall to the top of the rack. Installing the spring bars for the window is a PITA, but once the tent is setup, you can climb inside and unzip the storm flap AND screen individually then reach out thru them and install the poles. Easy peasy.
Some photos of them on Jeeps and other cars for reference.
Here is a great review of them on youtube that also shows setup and tear down. Some of his complaints are not issues in my book. Such as the color of the grommets or the tensiton rods having bows to them. They are a rod that is bent to hold the windows open, they are designed to do this. Its spring steel, it sets a little. The caps he talks about gluing on are not needed, infact I removed mine to make putting the rods in easier. His is the non vestibule model, so you can see the door issue. with blowing snow. BUT if your car is not tall enough to walk under it, the non vestibule model is easier to get into. I dont think many on here are over 81", so my height is a no brainer. Last, the sleeping bag he used, is the same I went with. Super great fit.
But as you can see, super easy setup and pretty slick. Prices range from $800 to $2500 with options. REI sells the smaller Tepui model and you can use your 20% coupon on it, AND free shipping if you ship to REI and pick up there. I paid just under $2100 (I got 10% off) with freight delivery at my house for mine.
https://www.youtube.com/watch?v=H6L4M13_utM