Make Snare
You can build a snare using 1gp of material in 10 minutes with the DC set by a Survival check.
Ranger Snare Skillz
You can build a snare using 5sp of material in 1 minute. You can find this material using a Survival check after 10 minutes. You have advantage when setting the DC of the snare.
Hyper Ranger Skillz
You can build and maintain preset snares, up to your proficiency bonus per long rest. You can drop these snares as a bonus action.
That isn't a complete rule.
What does "snare" even mean? What do they do? Do you mean that it works just like the spell? If that is the case, I'll try my hand a merging your ideas with the effect of the Snare spell.
Snare Setter
Basic Snare Setter: You can purchase a Snare Kit, or make a Snare Kit costing 1gp worth of material during downtime. You can set a snare in 10 minutes, with a Dexterity saving throw with a DC set by a Wisdom (Survival) check.
Expert Snare Setter: As Basic Snare Setter, except you can set the snare in 1 minute, and you have advantage when setting the DC of the snare. You can also find the appropriate materials using a DC 15 Survival check after 10 minutes.
Master Snare Setter: As Expert Snare Setter, except you can build and maintain preset snares, up to your proficiency bonus per long rest. You can drop these snares as a bonus action.
Snare effect: The triggering creature must succeed on a Dexterity saving throw or fall prone and be hoisted into the air until it hangs upside down 3 feet above the protected surface, where it is restrained. The restrained creature can make a Dexterity saving throw with disadvantage at the end of each of its turns and ends the restrained effect on a success. Alternatively, another creature that can reach the restrained creature can use an action to make an Dexterity (Sleight of Hand) check against your save DC. On a success, the restrained effect also ends.
First, I would not allow any version of that mundane ability in an open field or a location without trees/walls/verticality. The game doesn't work on video game logic. Environment matters.
Second, I will never again allow ability checks to determine the save DCs of combat effects. Ability check modifiers and totals are on a completely different level that saving throw modifiers and totals. It was a bad idea for grappling (I hope they keep the UA changes for grappling DCs), and a bad idea for traps.
- 3rd level Ranger, or the DM using an enemy ranger: OK, you trip the snare. I rolled a.... 24 for their Wisdom Survival check. That is the Dex save DC to break free. Good luck.