Is it a custom rom ?
Android needs an AV. So I suppose custom rom too. But it I don't know if AV supports custom rom.
For example time ago I asked norton if I could install it on cyanogenmod (not my phone ) and they said : it could work bad and we do not support those ROMs
My fault its on android 6 and i use most of the time apps i downloaded and less on the web, i download apps from other source outside of play store i just ask if i have to use it on remix os because its not normal android and i diden't want to do anything that will harm it or bring problems.You can use Android (Stock / Custom) with or without Antivirus. You may if you regularly:
- Rogue Apps (Unknown/Untrusted)
- Risky Sites (Phishing/Scams)
If available, Bitdefender Free Antivirus is sufficient for any Android user. Not sure if it's compatible with Android 7 / Remix OS