1 night in Hangzhou 2 night Shanghai

we are flying into hangzhou on May 22nd from Hong Kong and flying out of Shanghai on May 25th to Canada. We are ok with the 144 Hr free transit correct?

I'm just worried when we get there we may face trouble... Seems like we are good but would be nice for someone to agree :) I'll be happy not to spend $400 for the two of us for a visa.. seems crazy. Hoping we are good!

Megan