I of course tried spikes, I gave them to my friend who is still limited by them.
I would put a block under the front edge to tilt them back, to aim the tweeter to seated ear height at listening position.
I would put some smooth plastic 'skid plates' on the corners so I could alter the toe-in as needed for single centered or two off-center listeners
https://www.audiogon.com/systems/11516