A: Several years ago I bought an acrylic mason jar humidor for my brother who has a very modest cigar collection. They work great, too.
I suggest you place the cigars standing on their feet, since they’ll probably be easier to remove in that position; you could accidentally tear the wrapper at the foot if they’re upside down. I would also mount the humidifier under the lid, because you don’t want the exposed end of the cigars too close to the humidifier. The main reason is those jars are airtight when closed and tend to retain moisture, so keep a close eye on the humidity. If your cigars begin to feel spongy, either remove the humidifier, or unclasp the lock so some fresh air gets in there. They will stay fresh even with the loose top.
Finally, I would suggest picking up a small hygrometer, just so you can keep tabs on the RH. You want to keep it under 70% RH.