Hi,
Normally the busboards have a series of filters and components at the input. There they sell 16-pin adapters to terminals to be able to connect them at the entrance.
https://www.thomann.de/gb/nano_modules_eurorack_power_adapter.htm
There are also some fonts that have terminal output, I think Modulaire Maritime https://www.modulairegrid.net/e/modulaire-maritime-cargo.
"Can be used with two flying busboards but also have terminals to connect the fixed busboards."