I read the reviews and am so glad that I decided to try these out on my front porch. They are placed over cement and they look fantastic.  The install did take a few days since he did quite a bit of cutting and shaving tiles to give it a sharp and finished look.  I had ordered the trim and corner pieces, but they were delayed so I cancelled them and I'm glad I did.  I think it would've made the install even more difficult.  I'm already enjoying them with all the other purchases from Wayfair shown in the photos with the tiles. Highly recommend these tiles, but be warned they may be delayed in shipping. Also, if your area isn't perfectly square, you"'ll need equipment to cut them to really give it a nice finished look.
My measurements were for 143 sq ft total.  I ordered 15 boxes for a total of 150 sq ft.  Had just enough and a few extra pieces.  Glad I didn't add in that 10% extra as it would've been 1 or 2 boxes too many.