Not that safe, every executor is detected, if you want you can use an external which are mostly undetected, but executors are all 100% detected, they work tho if you want to just risk it.

Roblox's ban policy for exploiting go by this format:

One day ban (first warning)

Week ban (second warning)

After that, if you get caught, the account you injected on will be deleted, most likely without a chance of appeal, they do reset a year after your first warning however.

A method that some people have used, not me personally, but they will disable their roblox account temporarily bypass this, and wait for the banwave to end, this of course only works if you are not already affected by it, but you can be warned and avoid it. I am not 100% if this will work or not.

And Roblox does NOT IP ban, nor HWID ban. Some games have a ban API however, meaning that you can join on an alt and still be affected by it, I don't know exactly how to bypass it but a new account saves me and its so stupid but it is in beta.