I found them
Firs I rolled foil over the sub floor, then I nailed 1x2 every 12 inches, I put 1x2 in pairs with 1 inch gap between them.
I put omega (omega is the best do not use u-shape omega shape locks pex and holds it I stapled only plates on each end) heat transfer plates (they are pure aluminum). Tubes are locked in plates (this plates are usually used for under joist installation)
This is just bigger view. The missing spot in the middle is island in the kitchen (there is no point to heat it up)
I covered tubes with 5/8 floor plywood painted black from the bottom (just for fun
)