Three weeks later, here is the outcome.
A single enclosure all-in-one with GRHV and GRLV with high voltage and heater soft-start.
The 10M90S is attached to the side wall, and thanks to the large size of the metal, the temp is about 104â(40 â) after 1 hour.
The only thing is I made the mistake of the main soft start module(the one on the power outlet), which makes it only functional when you use the back power switch. In this way, I keep the front power switch on all the time to avoid the ripple current.
Still have a huge room to be improved. Planning to add a DC power supply for the heater for the DHT version, as well as the flashing soft start indicator.