I had Alexia 1's with Ultra 5's installed. I had the speakers on carpet, so I also used the stillpoint spikes. They made a positive difference and Stillpoints were well worth the money spent. I have since upgraded to Alexia 2's, but I am still waiting for the dealer to come and set them up (thanks Covid).
And there is an easy way to install the Stillpoints too. I bought a low profile jack and used that to jack the speaker up in place to install them. I believe Wilson sells this same jack for huge amounts of money, but there is an after market one intended to be used for lowered cars that is identical and much much less. Pretty sure this is the branded one I bought:
https://www.calcarcover.com/product/...minum-jack/705