It doesn't matter vCenter physical deployment for LMT, sine it uses standard VMware API to get information about running VMs in the cluster. The question is what vCenter is installed in the appliance? It should be supported as per the doc:
http://public.dhe.ibm.com/software/passportadvantage/SubCapacity/Eligible_Virtualization_Technology.pdf
#Support#SupportMigration#AIX