hi… must this be done manually or how can i spread out 4x4 buttons exactly …can one set the distance between each one?
like in fusion 360, you create matrix of your component…
Everytime i try the scaling of the grid seems to be a little bit wrong… 
In open gl there is the array function. (can be used to duplicate stuff on a grid.)
You can also try your hand with python scripting.
And you can use the user grid. (set the grid to the desired button spacing.)
Personally i’m a fan of custom grid sizes, you set the origin at the 0 point, then place them as you need it, main thing is you should make sure your footprint is centered on its origin, makes it easier.