All G81 have offset stems on 1.25 modifiers. There is a reason for that madness, which is the membrane matrix is universal for 1.25 and 1.5 mod models and due to trace routing the switch position couldn't be centered. I still think it was dumb, as I can't imagine printing different membranes would cost more than producing new keycap tooling and having to make multiple versions of the same key but... yeah.
As far as in built stabilizers, there is no such thing for doubleshots, at least that I have ever seen so there is no worry. I've yet to see that on POMs either, but I suppose they may have started doing so more recently. You can use those inbuilt stab clip keycaps with costars though.