One idea is to place them in your master closet or your bedroom or guest bedroom.

Next to buffet in dining room

Next to console table in front hall

Add a console table to your sofa and add the chairs to that for extra seating.

I live by myself, but have a huge family and often need to seat 12 or more people. The whole family is a bit over 30 people. My dining room set came with 8 chairs. I bought additional chairs that work with the dining room table, but are not identical - different backs and seats. This allows me to use the chairs around the house without it looking too repetitive.

I have 6 chairs around my dining room table. 2 chairs with a small table between them in my living room, 2 chairs with a small game table between them in my sitting room, 1 chair in my master bedroom (nice to have a chair when I put on or take off my shoes), 1 chair in my foyer next to a console table, 1 chair at my secondary desk and 1 chair in my guest bedroom. I also have 2 folding chairs in my garage and will bring the game table into the living room and expand my dining table to seat up to 16. If we have more than 16 people have to use the table on the patio (weather permitting) or fit where they can find a seat (sofa, hearth, floor).

A nice, stable dining chair can be used in almost any room of your home and not look out of place. They are also perfect if you have older guests who sometimes have difficulty getting out of lower chairs.

We have 8 chairs around our table all the time. Then we have 3 other chairs, same as dining in other spots in the house (office, kids rooms) and then on top of that we have chairs that fold down in our storage under the stairs. We pull those out for family events.