I guess your question is still not answered and I would like to know it as well as I am thinking of setting up some different masternodes as well.
I guess you need 5 different machines, 5 different ip's and 5 times a wallet with 1000 DRK. But maybe you just need 5 different machines with 5 times 1000 DRK and they can all run at the same ip... can anyone clear this up?
While I can see the convenience of multithousand masternodes, less admin for the operator, I think I'd prefer it it it was kept to single thousand DRK masternodes, purely for purposes of network resilience. The more discrete machines the better. Plus personally I like to split my resources and not keep all eggs in one basket.