If I got the shell plate any closer to eye level than it is now, my bullet and case feeder hoppers would be out of reach and I stand 6' 2" tall. My bench height is 42" and the press is pretty tall as it is now, so you need to figure that the max height of the bench plus the mount should not exceed the 42" height. While I can see inside the bullet hopper, I can not see inside the case hopper so I have to use a mirror or get on a step stool to look inside the case hopper. You could probably make 3 or 4 models with varying heights to accomodate benches between 26" and benches up to 38". Use the metal plate like I have for those benches over 38".
I did have a problem with the press flexing the bench so I took a 1/4" X 6" X 12" steel plate and placed that between the bench and the press. I secured the plate to the bench via 3 counter sunk holes (front under the press), the two press mounting holes using lag bolts, and two additional holes to the rear of the plate with through bolts. There is no flex in my press or the bench now.
I also thought of a mount like Dillon has but it takes lots of real estate and would not have been practical for my setup due to the bench height and bullet feeder but I can see how it would offer some assistance to lower bench heights.
Whatever you decide, keep in mind that any flex in the bench, mount, or press will result in unwanted variables. As far as bending over, I got the UR handle and it works well at preventing stooping while operating the press. You may want to have space on the mount for the opeional bullet feeder as it is normally attached to the bench. This mounting option would also have to be rather strong to support the weight of the bullet feeder when the hopper has bullets in it. The bullet hopper has to be mounted at the same height as the press or else it will not operate as designed. The case feeder attaches to the rear of the press.