The names of the ini and hal files is not relevant. If you want to you can create a hal file named "touch_plate" and add it to the postgui_call_list.hal file.
Alternatively, you can just write it in your existing hal. I wrote it in the custom_postgui.hal, but I think it can be also written in your main hal file.
What you need is this pin: motion.probe-input
I connected my touch probe using a debounce. (not strictly necessary)
net Tastsignal hm2_5i25.0.7i77.0.0.input-00-not => debounce.0.0.in
net Taster_debounced debounce.0.0.out => motion.probe-input
This is used for my touch probe, but as far as I understand, linuxcnc has only one input for tool touch off probe and workpiece probe.
To use both you would use an or2 to route both inputs into the “motion.probe-input”
At least that’s what I will try, as I received the same tool probe with a Chinese manual yesterday.