Last chance to get LP tanks in the basement easily

I am siding the house in a few weeks when the mill is done with the ship lap. I am looking at this as my last chance to get a propane tank in the basement. If I go this route, it will go through a window 46" wide and close to 6' high. If I don't do it now, the storage solution will have to go through a man door.

I have 7'2" from the slab to the bottom of the floor joists and planning on a boiler in the 25 kw range. First, is a propane tank the obvious storage solution if you can get it in the house? Second, is there a huge benefit to doing more than one 500 gallon tank with the smaller boiler? The primary goals are to heat the corners of the house that the stove has a harder time heating and year round DHW. This is the last house so hopefully many decades that I will have to live with whatever I do now.