Hi,

About your 45° wooden surface boards, I don't it very well, could you share some pictures?

To move multiple objects together I use "Group" feature, e.a. table with chairs grouped them as "TableSet", you can also "Group" them, "Move" your Group then "Ungroup" them.

Hoop to help you and see your reply about the board, even if you already solved it, it's a good practice to share how did it and help other members of this community having same issues.