1st off, Welcome
Goza mats work fine for extra floors & placing deeds. I’ve never tried stone. Place the mats & a ladder, stand at the top of the ladder, then raise the mats. Thru testing, you can tell where the Z-axis switches to the next floor because the mat will disappear when you move off the ladder. This is helpful to know bc it enables placement of most deeded items without clipping thru floors. Store bought or vet reward house tele tiles help where space is limited once you have roughly finished the design.
Tall items such as garden sheds and lighthouses should be on top floors due to clipping. Be VERY cautious placing such deeds bc if a single mat under a placed deeded item drops for any reason (there are some bugs/glitches which can cause mat/s to drop unexpectedly in places that can NOT be seen) and you try to redeed the item..... it breaks apart & u lose it. Due to this, I lost a garden shed. GMs will not replace items lost to deco misfortunes. When using goza mats, I recommend placing valuable deeds last, when ur certain exactly where you want them, & don’t remove them later. If you 2nd guess urself a week later.... live with it. You may be rolling the dice on losing the item/deed.
This mechanic does however lead to some interesting deco decisions as you can break apart graphics by lower a mat. Then your able to chop certain parts of the graphic away leaving desired specific graphics to raise or lower. I’d HIGHLY recommend testing this on simple 2x2 or 3x3 deeded items of little or no value b4 trying. It can lead to some pretty amazing designs or a nightmare that you cant wake up from.
Pro Tip: Single tile deeded items place on mats above larger deeded items can be lowered down into them freeing up room w less clutter. Ex. - All my forges have anvils lowered into to them. The anvils become unseen but offer full functionality when crafting.
Hope this helps !