I know that Linux is more secure than Windows and normally doesn’t need an antivirus, but know myself I’m gonna end up downloading something at some point from somewhere on the internet, and it would be good to be prepared. So, which antivirus would you recommend for Linux (Mint specifically) just to double up on security?
No. ClamAV can, for example scan Linux ELF executables and its database contains signatures for malware that could affect desktop Linux. The most common use case is servers that are distributing files, but it can be used to scan local files.
The local use case is fairly rare because malware targeting desktop Linux is rare. That’s partly because Linux users tend to have a better understanding of computers on average than Windows users, and partly because the sort of attack vectors that work well against Windows users don’t align with Linux workflows (e.g. if you want to execute a file sent as an email attachment, you’ll have to save it and set it executable first).