FWIW, putting aside the actual quality, I've always worked to a factor of 5 for magnification to aperture, so 8x40 or 10x50 (10x60 would give a brighter image but becoming too wide/heavy) . A lower factor gives you a dimmer image.
I had a 10-20x50 zoom pair for a while but the 20x mag was too dim to be of use except for looking at the moon.

I can't help with the mounting although gun clubs use binocs on stands for target spotting.

our local Lidl store will be selling 10x50 for £11.99 from Mon 7th Apr which I will look at, (being a cheapskate). ;-)

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Life is its own god.

Can you please ask the voices in your head to keep the noise down?