I thought it might be helpful to have a thread that listed the display dimensions of the common pistol optics and have a discussion about display characteristics and shootability.
Here is a quick whack at dimensions, that I got from some Google searching. Feel free to correct and add to these. Subsequently, I have added the optic footprint.
Aimpoint P1/2 .63 H x .63W; Acro footprint
Holosun 507C .63H x .91W; RMR footprint
Holosun 508T .63T x .91W; RMR footprint
Holosun 509T .66H x .90W; proprietary footprint although RMR adapter is included
Holosun 507 K .58H x .77Wv; slightly different than RMSc footprint
Leupold DP Pro .69H x 1.01W; proprietary footprint
Shield RMSc (need measurements); RMSc footprint
Sig Romeo 1 Pro .70H x 1.1W; close to DP Pro footprint but slightly different
Sig Romeo 3 Max 1.0H x 1.2W; close to a C More RTS2 footprint
Sig Romeo 3 XL 1.0 H x 1.26W; close to a C More RTS2 footprint
Steiner MPS .63H x .63W; Acro footprint plus plates
Trijicon RMR— tricky, because the listed display doesn’t take into account the emitter housing that blocks part of the display. RMR footprint
Trijicon SRO .89.H X .98W; RMR footprint but rear BUIS needs to be behind optic