All of them. FR FL RR RL and IWB 6 o'clock. Also, small of the back, horizontally mounted with Tek-Loks.
Not all at the same time. Usually two or three. The right rear pocket is probably the most out-of-the-way when not needed, and in addition is the best place for a right-handed draw of a zip-tied Spyderco.
FR works just fine for Emersons.
If you're worried about losing knives, try tighter or deeper clips. The lower the center of gravity, the less likely it is to work its way out of your pants. Guess that applies to many things.
Also tucked into both boots, alternating between inside or outside depending on the knife and how it carries against the calf. I spend a lot of time on my feet, so the RR RL and small of back carry may be unsuitable for you, especially if you sit at work. I've found when crawling, the easiest to get to can be RR, RL, boot or neck.
My knives fight for pocket/belt space with my lights. Usually there's about an equal number of each. Lights tend to fall more easily, given that not all of them have clips, and round long bodies get snagged/fall out of pockets more easily.
, I carry mine in my front right pocket, which is the only thing in that pocket.
