Why take the chance and make it harder on yourself to mount the scope? What benefit do you get out of vertically split rings vs traditional... serious question?
I've mounted multiple 100's of scopes since 1975, using pretty much every ring/base combo available.
I've shot competitively in multiple disciplines since I was 12 years old (over 45 years, wow!, that's scary!)
Anyway, the vertically split rings have their place, I specifically like them in 2 areas...
First, on a true hard use hunting gun that will be slid into and out of a saddle scabbard quickly, they make a nice slick sided package that does not drag when getting pulled. They are also one less thing to poke and dig on you if you carry flat slung in front while hiking.
I also like them on a hard use AR for the same reason I hate charging handles that tear holes in me when I'm running and climbing slung up.
Anyway, for installation (as 308pirate said), just remember to fully torque the bottom screws FIRST, leaving the top screws totally loose, level scope and get eye relief, then torque top screws....simple.
People don't read the directions and try to tighten them in a top/bottom crisscross motion (like a normal horizontally split ring) and it will not work, period.