see how the feet stick out, making a larger space for the feet, less likely for a tall slim speaker to tip over

You can make a separate platform, with spikes, that you position and pre-level, and then put the speaker with the iso devices on the platform, Widen your base, and much easier to try adjusting toe-in, alternate toe-in ....
https://www.audiogon.com/systems/11516
ps, to try with or without spikes, simply flip the platform you buy/make over,
btw, I tried spikes with my JSE Model 2's, then changed to 3 dual wheel casters with rear anti-tipping blocks, gave my spikes to my friend.
When I visit, if I don't sit in the middle, the imaging is too single sided, and he cannot move his spikes.

