Samba Reggae 1 is probably the most ordinary way, to print only the lower board out from under the front panel and Pin 1, vertical PCB mount, https://www.neutrik.com/en/product/nl4md-v-2 speakON Chassis Connectors, 4 pole female XLR receptacle, grounding: mating connector shell to pin1 and front panel, horizontal PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3mbv-b B Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, horizontal PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3fah1-da A Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3fbh2 B Series, 5 pole female receptacle, grounding.