Newbie - pls help with this hypothetical scenario

Hi everyone, I know very little about two way radio communication and have been scouring the web to learn as much as I can.

My hypothetical scenario:

Five adults, rugged terrain, off grid. Ample solar/wind power. No legalities regarding government licensing. Primary utilization is security/integrity/reconnaissance of our property. No base station, no repeaters. Units must be capable of “secure” communication, etc. Must be extremely durable - one time purchase. From what I’ve read, it seems we’d be lucky to get 2 miles range. Willing to spend up to ~$300 per unit - maybe more. What specific handheld unit would you recommend? Thank you.