When I bought my 90mm for my 4x5 Cambo, it came mounted to a recessed board. I also bought a bag bellows for movements. I don't know any reason not to have the lens mounted to a recessed board, although you might need an "angled" cable release adapter to access the place on the lens barrel. Once I had the bag bellows, I never carried the long bellows with me again (including for the 210mm lens) unless I knew I was going to do work at less than 3-5 feet from the subject.
This is my situation, I don't know how it would apply to you. There are others on this forum with more gear knowledge. It might be useful to know what camera you have.