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the debate about humidify the room vs humidify the guitar in the case goes on and on and on.
I don’t have recommendations about a room humidifier. I also do not know much about them other than what i’ve read on the forums. Seems like using distilled water is key and also the type (vapor, mist, evaporative) is also important. If memory serves me correctly, the evaporative is the one to get as it actually adds humidity and not water vapor. Water vapor is not a good thing. That being said, never keep your guitar in bathroom while showering. Despite what some may say, this is really a bad thing as that is water vapor and the wood will soak it up like a sponge.
What you need to do is 1) get a room hygrometer and a case hygrometer. You need to know what the RH is before you do anything. 2) you need to decide what is best for you and where you live. A lot of players humidify the room. Others the guitar in the case. Some neither. Tony does both. He has guitars on his walls in his home studio and humidipaks for the ones he keeps in his cases. Your local luthier will probably be your best source of information as they live in your area.
I have 1 good guitar and I keep it in it’s case with a hygrometer. Currently in my neck of the woods (Centralish North Carolina), the RH in my case is in the mid 40’s. So I don’t need to humidify it. Earlier this year I had to take the humidipaks out because they were not working correctly and the RH in my case was 60 and above. I also have a big bag of what feels like rice I got from Amazon to remove excess humidity in the case.
Hope this helps.
John