I think people are trying to search for the profit from POS. The proof of stake is easy to do and don't need too many things to start. You can run masternodes, or you can try to join with the shared nodes. And if you have the limit budget, then I suggest trying with the shared nodes so you can start to earn some rewards.
The pool that I know it could be used for staking is:
Stake-cube.net
Btcpop.co
Or you try to visit
https://masternodes.online/ to find out more about masternodes. You can also search for the other coin that could be a POS and where they can be staking.
And if you want to start your own masternodes, it will need a big cost to start because you need to have VPS which can online 24 hours and 7 days, so you don't miss any rewards.