Hi,You should not have any problems with that. App Store Connect has a company switcher at the top right corner, when you click on your name. AFAIK, Apple is okay if you manage different company accounts. I do not think they would consider that as a spam, as long as you are playing by the set rules and not abusing it.Good luck.
Akaki
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You can remove specific testers or group of them from TestFlight. Go to App Store Connect > My Apps > Click on your app > TestFlight should be 3rd from the top row and click on it. Through there, you will see Testers & Groups section on the left and go to All Testers. There should be a button on the right saying Edit, click on it and I believe that's how you can remove someone from TestFlight.