Does anyone know all furniture with surfaces you can display things on, or is there a list somewhere or something?

The site Moridb has a search engine where you can look up items in ACNL, like tables, and counters, etc.

For the Welcome amiibo items you can find this in the Wa Items Table. Select "Utility" for the column and enter "table" as search string, press GO or Enter and you'll get a list of all items that can have something placed on their surface. If you wish to know which items can be placed on surfaces sort the "On Top" column.

I wrote this feature while I was still learning how to do this so apologies if it's a bit clunky. The data is correct however, or at least no one has pointed out any errors so far.

If you wish to see the evolved version of this kind of table please have a look at the Pocket Camp guides: the Crafting Guide and the Character Guide.

Yes! Thank you so much!! This is exactly what I'm looking for.