There are some things to consider:
1. Do you strum particularly hard?
2. Your sensitivity to 'buzz'
Does the guitar sound like it's buzzing when it's plugged in?
It may be that the guitar was set up fine from the factory for someone with a lighter touch, but more aggressive playing styles will warrant higher action, so it might not just be a truss rod adjustment, but also saddles.
I would highly recommend taking it to a well known tech instead of DIY for the guitars you bought. It's a tiny fraction of the price and will be done right.
A good one will talk to you about your technique and your preferences for how it plays.