I do love my laser level, but not for speakers. All that 1/4 inch perfection seems silly when your head is not held in a clamp. Eyeball height, toe to your preference.
Experimented with all that spike and isolation stuff. In deep carpets, spikes help stability. ZERO sonic difference. My speakers sit on that waffle shelf liner on their stands. Won't slip and no resonances from the stands not being perfect. Not as messy as Blu-Tac. (Vietnamese ceramic elephants) Spikes, balls, feet, just one more place where what may seem logical has been leveraged to make a lot of money selling snake oil with testimonials based on placebo effect. Want better sound? Buy better speakers.
Funny how we buy bookshelf speakers and put them on stands. I would have floor standers if my "domestic distortion" also known as my right to keep breathing or else, did not mandate the living room looks like a living room. If it was a listening room, I would have full range floor standers. Alas, the elephants stay.