A: was wondering if, since the browser windows are using different Proxies/ look like they're on different computers, would this affect the "machines" count?
>>> The "Machines" count is every time that you activate your RTILA Studio license on a device it will deduct one count, but you can release your Machine activation count so that you can install it on a different computer see the doc here: https://rtila.com/docs/manage-license-activation-count/

It is possible to set up RPAs directly in AdsPower using the scripts, so I wonder what this would do if I can copy the script generated by RTILA and plug it there (if it's even possible).
>>> No that will not be possible. RTILA bots can connect/login and automate/manipulate your online websites/accounts.

Or if we can only run the scripts locally if we, say, only have access on 1 machine.
>>>
Yes that is doable and even with just 1 machine you can activate and de-activate the license to use it on a different device if/when needed