reflow some solder over the load carrying traces ive had a few that look a little skimpy and for a few pence its worth bulking the traces out only really an issue if youll pull more than a few amps id say though

With mine i solder on some headers to the comm pins although be very careful the gnd on the pow devices is a hot ground so mains voltage if you have it plugged in reflash the devices with espurna using espeasy and the espurna

If youre going to reflash them this isnt a problem but if you expect them to justwork™ then you may well be disappointed

out of paranoia kapton tape something like a ds18b20 against the traces so if it gets over n degrees i can kill whatever the load is accept theyre made from chinesi