Yes, the Midwest Industries Aimpoint T-1 QD Mount will work with the Romeo5 XDR.
Yes this should be compatible.
Yes, this should be compatible.
Yes, the Midwest Industries Aimpoint T-1 QD Mount is compatible with the Sig Romeo 4H.
Yes, the Midwest Industries Aimpoint T-1 QD Mount is compatible with the Holosun 515GM since is shares the same Aimpoint T1/T2 optic footprint.
Yes, the Midwest Industries Aimpoint T-1 QD Mount will work with a Weaver rail with a mounting slots 1" apart.
The Holosun HS512C does not share the same footprint as the Aimpoint T-1. So the Midwest Industries Aimpoint T-1 QD Mount will not work with the HS512C.
Yes, the Midwest Industries Aimpoint T-1 QD Mount will hold up to the recoil of a shotgun.
The Holosun HS507C-X2 Reflex Red Dot Sight uses the RMR footprint. So this Midwest Industries Aimpoint T-1 QD Mount will not work since it is for the Aimpoint T-1. However, the picatinny mount located at the link below will fit the Holosun HS507C-X2 Reflex Red Dot Sight.
https://www.opticsplanet.com/midwest-industries-trijicon-rmr-lower-1-3-qd-mount.html
Yes, the Vortex Spitfire HD Gen II 3x Prism Scope will mount to the Midwest Industries Aimpoint T-1 QD Mount.