They are either in watch boxes (I have 3) or a wall mounted cabinet (holds about 50 watches) or on on my shelf in the bedroom, oh and once leather briefcase that i converted to hold watches (nearly forgot about that one)
The answer is simple, I built a nice Glass fronted 50 watch wall cabinet that I filled up inside year 1 of getting back into collecting. That started November 2023 so this year I just built a 100 watch cabinet which will likely be filled up before new year 2026.
I've another 2 watch buys this week now winging their way to me