Apart from 100k ARO, which I think is fine and measured amount (and which should limit constant dumping we saw in the recent months), what are the other requirements to meet? If one would like to run more than one masternode, I guess that would mean running separate wallets, or would there be some other solution?
Yes you can run more than one MN. It is suggested you run each MN on a separate VPS/server. From what I heard, 4 core / 8 GB ram requirement. Not sure if there is leeway if running Nginx/php-fpm verses say Apache. The server's IP cannot change for the duration of the (active/not matured) MN.