Many of mine are displayed in numbered cardboard boxes in an undisclosed location.
All are scanned though and only a couple of clicks away in virtual corresponding numbered boxes on my laptop. I would need dozens of Pennzonis and a bigger home otherwise.
My modest display cabinet shows a rotating selection of cards tastefully arranged that no one looks at for more than 5 seconds except me.
When I tell new and old friends that I collect prewar baseball cards, rarely do I get any response at all, not even an "Oh".