ChristophI fugured that it's possible to have two PCBs with screw terminals on top of each other in one of those cheap connection boxes - and they actually do!
Lower PCB with all the high voltage stuff (2 SSRs and an optocoupler to detect zero crossings), terminals (heaters and mains) and 12 mm spacers:
Upper PCB for the Teensy LC, ADC, cold junction thermometer and screw terminals for the thermocouples:
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