As aussiegirl says, you can be outside of Australia when PR
is granted, so no problem in that regard.
You need to notify Immi using a Form 1022 of that intent and having an email address for contact if you do not already.
As for providing information for the PR
review stage, you'll probably find it is relatively straightforward and involving a third perdson could just lead to complications for you, but if you want to have someone else as point of contact, use Form 956a.
On granting of a PR
there is usually a requirement to enter Australia by a certain date to validate it and that can be just a fly in, through Immi and fly out again if you want it to be like that.