I can help you with this as I'm already managing 250 masternodes on a vps platform and I do daily surveillance on them to make sure everything is okay. So far I take care of them since 28.05 this year and none of them got down not even a day as you can see on a photo I will attach. ( I can't show you the masternode as I must protect my customer ).
I will be glad to help you out with those 1000 nodes and we can start whenever you're ready. I will hit you with a pm here and on telegram as well. I'm also a network engineer so I can assure you everything will work smoothly without any problems <3 .
Thanks.
Just a few of them to see they work without problems for so many days.