Yes, the hole of the plate just aligned with the hole on the chassis.
When I start the printing, the head is coming down to the bed and touch several points and
go up showing error message. I cleaned up the bed clearly and made the bed flat and clear the nozzle end, but got calibration fail all the time.
Before in the beginning, when I tried printing first time, it was sometimes OK except 'tilting' error, which I do not understand why...