Earlier quoted context omitted.
for your family cal, check out TRMNL. can go on a fridge w/ magnets: https://usetrmnl.com (disclaimer, i'm the founder)
My fridge isn't magnetic. A lot of modern fridges aren't. Might be a neat idea to offer a magnetic mount for it, like a flexible flat magnetic board shaped to fit the TRMNL with a sticky backing so you can attach it somewhere and then use that to attach the TRMNL (your site doesn't seem to say anything about being magnetic so I'm guessing you have to attach magnets to the TRMNL too though?). For that matter, the site…
I came into possession of several sheafs of the A4-sized ones, which now serve as "generic surprisingly heavy objects".