You don't need a "server-side executor." You need a backdoor finder and a standard free executor . This is highly technical and requires Lua scripting knowledge.
Using any third-party executor violates Roblox Terms of Service: Free Serverside Executor Roblox
Using any executor is a violation of the Roblox Terms of Use . With the implementation of the Byfron (Hyperion) anti-cheat, Roblox is much more effective at detecting and permanently banning users who attempt to inject code. You don't need a "server-side executor