How to make acoustic wall panels

My shop has a massive echo, and this week I'm starting the process of fixing this issue with some stylish acoustic wall panels that no only help with the sound but also give my empty gray wall some character.

These are the panels I got here locally: https://www.biltema.no/bil---mc/biltilbehor/lydisolering/lyddempingsplate-2000017199
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Видео How to make acoustic wall panels канала Alexandre Chappel