the prostaff will have no problems on an xbolt. the height that you choose should be whatever is most comfortable for you that will not interfere with operation(which is just about any commercially available rings). if you have to smash your cheek into the stock to see through the scope then it's too low. if your chin has to rest on top of the cheek rest then it's too high, you want a nice medium somewhere and sadly the only way to know for sure is trial and error. if you take it to be professionally mounted some shops will let you try a number of ring heights before mounting and only charge you for the ones you pick.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
I never said half the stuff people said I did-Albert Einstein
You can't believe everything you read on the internet-Benjamin Franklin