I carry most fixed blades with 5” and under blade length horizontally at about 1100 o’clock to allow for either hand drawing. I carry a fixed blade daily, and find this position great all around. Lots of great smaller fixed blades to choose from. Really depends on your price point, needs/wants for overall and handle/blade length (I prefer a full grip vs 3 finger but some are great regardless), steel, etc.
Lots of great suggestions listed. Some of the ones I carry horizontally from makers on this site are: CPK, CPE, David Mary, Kornalski ODC, Slaughter, Volunteer Knife models 3, 4.2,4.5.
Terava 110 is great and a handy size. ESEE Izula with extended grip is a really great small knife. If on a budget, Cold Steel Master hunter and Mini Pendleton are great with aftermarket kydex.
There are many others I hope to try soon.