Need advice for smartwatch usage

For safety, I want to wear a smartwatch with fall detection while riding my horse. I have very poor cell signal at my home and mostly use wifi calling, but the wifi doesn't reach to the riding area. I'd like to use the smartwatch without carrying my phone with me. Without a decent cell signal, are there any other options when I'm outside? Do I need a cell signal booster (I haven't found one for outside) or a wifi extender or both? Will a smartwatch work with just wifi to call out in an emergency? What kind of expert do I need? TIA!