I have yet to find a 2 - 4 unit and have found out it is due to many local restrictions on these type of properties. (biggerpockets.com)
If you are unsure of local restrictions in your region please visit your local language website (select from the menu at the top of this page) or Contact Us for more information. (home.saxo)
You also must be mindful of the other local restrictions and regulations around third - party requests and suitable content. (entrepreneur.com)