Since it is so early in the existence of the M1-based Macs, the best way to approach things might be to decide on two or three candidates that you might be willing to purchase, and then go to the developer's Web site and see if they list M1 compatibility, or even better, they offer an M1-specific driver. If neither is in evidence, I would e-mail the developer(s) and ask them specifically about M1-compatibility.
If that all fails, you might want to consider purchasing a scanner that is attractive and which also is listed as being supported by one of the commercial third party scanner drivers:
Exactscan Pro
ExactScan - High Speed Document Scanning
(if you mostly scan documents)
Vue-Scan
VueScan is the easiest way to get your scanner working on macOS, Windows and more. VueScan includes a driver for your scanner even though it isn't support anymore.
www.hamrick.com
(if you mostly scan graphics)
A final option might be to use your iPhone as a portable scanner using:
Scanner Pro by Readdle
(turns your iPhone into a surprisingly competent scanner)
Readdle is a pioneer of iOS App Store, one of the first companies to create file management and scanning apps on the App Store. Our main goal is to help you, boost your productivity and give you the ability to use tools that haven’t been available on mobile devices before. Scan documents, sign...
readdle.com
Effortlessly scan, organize, and share documents on the go to have everything you need at your fingertips. Scanner Pro brings you high-quality document scan technology in a convenient and simple mobile app. Scan agreements, receipts, IDs, books, and more using your device to convert them into...
itunes.apple.com