My apologies for such a tardy response, though I do appreciate all the feedback and bonuses!
Not quite sure how to quote everything in response to each person so I’ll sum it up as best as I can.
My truck is a full-size crew cab and the cb antenna I have now is NMO mounted at the rearmost part of the roof. The cb is a Uniden Bearcat 980 and the antenna is a laird c27s.
I currently have a NMO provision (bracket) on the front fender for a future scanner project. The lowest frequency that I intend to scan is 108ish MHz. Pretty much an interest in air traffic, both civilian and military.
Weather monitoring would be a waste since it is handled by the 980 anyway.
As for the mount for the frs/GMRS antenna, it would be the same as the cb, nmo mount. I waved past a midland antenna in favor for a laird b4505cs due to my own positive experience with the c27s.
I hope this helps in clarifying things and potentially assist the next guy if the shoe so fits.