I'm endup paying another tile specilist to do my job due to
1) Expirence: Tile over tile can't work on 2x2 due to the edge design
2) may not be balance and may injure the leg
3) Need really expirence sifu to do it, as it may other problem such lke tile pop up which will impacting the whole Floor
4) 2 x 2 tend to impact of whether, as accoridng to the manifacture lot of people having such problem, may cause tiles pop up.

Hence after get the specilist advice and price seem OK. I put the job from existing contrctor and hacked whole kitchen / living room tiles out.