The cbu will move, then the tile will move. The grout and the the will crack in short order. The cbu and then the tile must be properly bedded.

Not sure if it will work for your project, but I've "tiled" over rental balconies before using Ikea's Runnen tiles (I've used both the wood and gray finishes) - both worked really well. They lock together and float above the concrete surface. Super inexpensive and easy to install. Both were covered balcony applications, but weathered well (in Southern California, mind you - but still).

It looks like they've expanded their options to include tiles that look like actual tile and now have more sizes as well: https://www.ikea.com/us/en/cat/outdoor-flooring-21957/ 

Cool, will take a look at the floating option!

3M double-sided VHB tape can stick tile down temporarily. VHB means very high bond.