Typically, multi-homing means having an ASN and using BGP, or having multiple providers with BGP announce your prefix. So, a server in a DC might count, if you can get them to announce your prefix, though they'll probably want to announce their own prefix and give you a chunk of it. Your home network probably isn't going to be announcing your prefix.
It really depends on what you're trying to achieve by having a direct IPv6 allocation...
I hear what you're saying but if you aren't going to publicly route those IPs, ARIN has allocated fd00::/8 for that use. If you are going to publicly route your IPs, ARIN has no problem allocating you the space.
It really depends on what you're trying to achieve by having a direct IPv6 allocation...