Hey snap, I have a similar unit here.
I already have the Little Giant VCMX-20ULST 554550 VCMX Series Automatic Condensate Removal Pump With Safety Switch 115 volts, 1/30 horsepower but have not installed it yet.
I'm waitining on plumbing issues to be resolved first.
Get you a condensate pump off amazon. That hole is a French drain. It can’t handle the volume of water your humidifier puts out. Little Giant VCMX-20ULST 554550 VCMX Series Automatic Condensate Removal Pump With Safety Switch (115 volts), 1/30 horsepower https://www.amazon.com/dp/B002MGYF3S/ref=cm_sw_r_cp_api_i_YhjBCb1ZRH3NN