One of the greatest and most overlooked mods for Valheim is the one that puts a stonecutter on a cart. https://www.nexusmods.com/valheim/mods/1576

If u need yes

Yes, part of the game design, you can always destroy the previous ones to get the mat back.

Yes its normal, and yes its ♥♥♥♥♥♥♥ annoying to have to do. God I wish they would change that, I don't like having to deconstruct and place down that infernal thing EVERY 10 FEET.