I have 3 gaming PC's in my home that I want to use for mining ETH while they are not being used. They're only really used on the weekends, so all week long they can be mining. All 3 rigs are almost identical. Ryzen 5 CPU or Core i5, all have 16GBs ram, all have 650W or higher PSU, all have RX 580 8G cards, and all are running Windows 10.

I've set up each one with phoenix miner, added the correct settings, and have all 3 mining to ethermine.org., and all 3 dumping to one Metamask wallet. When I look at whattomine.com, it says a single 580 should be getting a daily reward of 0.0017 @ 30Mh. And for 3 580s the daily should be 0.0052 @ 91Mh. When looking at the dashboard on ethermine.org, I can see all 3 rigs as active workers. however, even with all 3 running, I'm only getting 0.00099 rewards per day, and avg of 22.6Mh. I've tried looking up how to set up multiple rigs in one home, but I'm not seeing any answers online.

I do realize my Mh will we lower than normal, as I have not set up the cards specifically for mining. They are still using the most recent version of the Radeon Software meant for gaming. Does that really lower the Mh rate to an average of 7-8Mh per card?

I do get the impression that the pool sends out one work order to my IP, and work order is shared between all 3 rigs, and you only get credit for 1 rig solving the work order. So if that's true, then how do you set up your network to allow each machine to work on a separate block? I've tried adjusting the pool order for each rig, so they are each focused on a different pool, such as, rig 1 is focused on the east US pool, rig 2 is focused on the west US pool, and rig 3 is focused on the EU pools. It doesn't change my rates or estimated earnings.

Any help is much appreciated. Even if you just point me in the right direction. It's possible I'm just not using the correct terminology when searching for my answer.