That's not something you can have at your home though, no? The DEXA/DXA scans machine I know of are something you can't keep at the comfort of your home.

In my personal experience I have found impedance ones to be fairly accurate(~10%, BF range 10-16) and for most people the accuracy of full body ones is good to have a general idea about their body. Probably when you reach sub 10 levels, accuracy matters more.

Btw, here is the link to studies they give: https://inbodyusa.com/studies/