Congrats on the awesome speakers! Look nice and sound even better.
I would not worry about isolation - a shag carpet is about as dead acoustically as it gets.
If you prefer the aesthetics of raising further the speakers then ask ATC if they can get you longer spikes.
Honestly a wood block or stone tiles is going to look real Mickey Mouse - like a student in college with speakers on books in their dorm rather than an owner of some of the finest sounding speakers anywhere.
I would not worry about isolation - a shag carpet is about as dead acoustically as it gets.
If you prefer the aesthetics of raising further the speakers then ask ATC if they can get you longer spikes.
Honestly a wood block or stone tiles is going to look real Mickey Mouse - like a student in college with speakers on books in their dorm rather than an owner of some of the finest sounding speakers anywhere.