Where would the holo go on the bar?  I don't see an empty smooth surface that would allow the holo to stick cleanly.
 hello bithalo  
 
 No , there's no specific place on the bar for the Holo.  They are there to seal the paper wallet.
 Best regards 

Are you providing the paper wallet along with the bar?  If so, are there pictures of it?  If not, then the holos don't really serve a purpose other than giving us generic holos for us to use elsewhere.   
The .999 Fine Silver concerns me, when the bar is plated.   Items should not be stated Fine Silver, which implies that its solid, when they're plated.
I do think the design in nice and wish you well with your project.