PS. The tallest fixtures I had in my personal set was 7-1/2". I built the SR Batteries 1/4 Scale Fokker Eindecker with that set and didn't have any problem. The 9-1/2" fixtures would have been handier toward the front of the fuselage but the 7-1/2" fixtures didn't cause me any problems.

The set I'm currently making for myself (I'm selling my original set) will have fixtures up to 11-1/2" tall. Anything over 9-1/2" has 6 magnets instead of 4.

If you put enough force on the vertical presses, the front of the press will lift from the board. I made "monster" press fixtures using a 2-1/2" bolt with 4 magnets on each side (instead of one) for the front of the fixture and just the two in the back. These presses can torque down significantly without lifting. All you need is a longer bolt and a few more magnets.