Shooting in the basement and MOA rail question

So with no time to go to range I decided to build a dedicated indoor air gun of 10-12 yards, pls don't laugh...

SO just thinking if I have a scope with very little elevation adjustments and mount on rifle is a zero moa rail the shot goes low, as I picture in my mind the scope aim is parallel to bore at 10 yards.

SO I adjust my scope up clicks so that the shot goes up but I run out of up elevation. I put the scope back to middle adjustment.

Then I raise the back of scope (downward incline ie 40 moa rail) Again aiming at bullseye 10 yards the shot can go either slightly low (less likely) or higher than bullseye (more likely)

AM i understanding this correct. If im adjusting the up elevation clicks it is similar to the back of scope going up. So in my situation if the rail is already pushing the back of scope up and my shots are going high at 10 yards i have to adjust low to bring the back of scope down and the shot to come down close to bullseye.

IS THIS WHAT IS HAPPENING? This brings me to my question. If you have a rifle with a built in 40 moa rail and we are told to help with long range shots. This would also be good for very short range such as 10 yards????
 
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