Want to schedule multiple Defender malware scans per day

We use Defender (and a couple other tools that catch a few things Defender overlooks) and have a malware scan running daily … this is a start but we’ve had several instances where a scan ran (clean), only to have the site be infected an hour later and get flagged by Google. It would be helpful in an era where brute force attacks are so prevalent if I could automatically run a scan every 2 or maybe 4 hours. Any workarounds to make that possible?