Ours is only a cupboard sized room, no window - so we also stacked the washing machine and condenser tumble dryer.
We put 2 shelves along the side, running front to back along the depth of the machines. The bottom shelf is high enough off the floor that the brush and mop fit under it, and they are narrow enough that the legs of the ironing board (just) fit between the shelf and machines. The basket (and long BBQ tools and 2 ikea peg octopuses) live on top of the dryer).
The shelves have enough space for the various cleaning liquids, washing tablets, colour catcher sheets etc to live. With more rarely used items (ant powder for summer, re-waterproofing wash for coats etc) up high at the back.
We have an Ikea holder for the iron screwed into the wall lower down (take iron out and can remove the ironing board, but it's low down enough that the mop/brush can come out over the top without removing iron). And right above that, just over the light switch, we have a dyson chordless station (the vaccuum itself swings out just in front of the machines to take it out to use). So have packed a lot into that small space.
If i had more space, I would do things differently for sure - but that was all the space we had. Having the light is useful at times to see what's up on the shelves. And even though the shelves are very narrow and run away from you, they are surprisingly useful.