Putting A Floor In A Jonboat Do I Have To Put Thin Set Mortar On The Back Of The Tile After Putting A Bed Of It On The Floor Also?

Do I have to put thin set mortar on the back of the tile after putting a bed of it on the floor also? - putting a floor in a jonboat

I tile on a concrete floor. I have a thin layer on the floor before a tab. Should I also put an end to the back of the plate before it?