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...
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...