Route mode +Snat+servers belonging to the same pool on different subnet??

TMM doesn't care whether the pool members are all in the same VLAN or even if they are the same number of hops away - you can have pool members in directly attached vlans at the same time as pool members in a different site. The only thing would be....if the site is remote (as in significantly different latency between them), you could consider using priority groups to prefer pool members in the local site and only use pool members in the other site if only X (or less) servers available in local site.

Also, you may need to use a SNAT, you may not - it depends on your network topology.