Meter/Track Energy (IR Sensor) , Gas (Reed Sensor), Water Consumption with S0 Signals

Hello,

I am new to this.
I love to know what’s the easiest way to track multiple S0 Signals from different Sensors and get them into Home Assistant.

Got an Electricity Meter with an IR Sensor that gives out S0 Signals
Got two more Electricity Meters with S0 Signals for the Airconditions (Eltako WSZ15D-32A)
Got one Reed Sensor for the Gas Meter (similar to ES-GAS-2)
and Plan to get one for the Water Meter too.

looks like Powerfox has a sensor for each of them but I can not find the Home Assistant integration.

So I need five, better eight Input signals.

What’s a good reliable easy-to-use Hardware component to get these Inputs.

Plan to install Home Assistant on a Rasberry PI and place it near the Breaker Box / Gas Meter / Water Meter.

Thanks.