wood holder for cnc machine

i have some timber i get from B&Q and wanted to engrave / router on it.
the wood dimensions i am using are 38mmx63mm
i can make other sizes if you require
https://www.youtube.com/watch?v=jaglvxxmSNA


Then i fancied routering on all 4 sides.
so i designed up this holder to all the piece to be held in place in its height and width orientation centralised.
this should allow me to router down the length and then flip it to the next side and router that and so on until all four sides a