Multy X Placement

Good day all,

I have a couple of questions regarding the Multy X and believe it is called multi mini.

1.
Is there any pros/cons or restrictions on the placements?
Then thinking of since it has a bottom rubber ring/plate it is designed to stand in a shelf or on a table.
Will there be any issues hanging it on the wall or even placing it upside down in the roof?

2. Any recommendations on an app or similar to do some tests to find best placements in the house?
I have now 6 multy x covering the area over 2,5 floors with massive walls and other obstructions in an L shaped house..