Need to install an ELT and want to keep it from making too much difference in aft CG. Where did you mount yours?

FAR 91.207(a)(2) says... an approved personal type elt or approved automatic type elt must be installed. What is an example of an "approved personal ELT"? Could this be something like a SPOT or ACR Rescue link?

Need to permanently install external data tag. Where and how did you mount yours? Did you drill holes in a longeron or just rivet to fabric with internal backing?

Thanks!
Jon