My home defense shotgun is a 20” 870P, which I have a MS3 on, is setup as single point. I leave it that way so I can leave it in a position that will not get hung up on the mount, and still be easy to toss on. I do have a mount to switch to two point, which I try to do on all of my guns.
I also have a TAC-14, which in its stock form, I have two QD points for my MS4; one on forend, one on plate in front of grip (had to modify the sidesaddle plate for it to fit). I like to have options, so I also picked up a Suarez International Folding Brace for it. Due to the design, I couldn’t run the plate because of the gap between the Magpul grip and trigger guard/safety.
To figure out the rear QD point, I pulled the sling loop on top of the folding mechanism... threaded post with a lock nut. Got the Magpul Type 1 QD mount, went to Lowe’s to get a similar bolt/hardware... and solution is found. I got stainless, but going to be a moot point, as I will be having Robar redo the entire firearm in NP3 Plus. But with the profile/weight of either setup, I prefer single point for it. If I needed to secure it better, pop the sling loop apart and put it in the forward QD point.