Tulips should fit 5 or 6 per 6" pot. I usually plant mine so that the tip, or even shoulder of bulb are out of soil. Remember to plant the flat side of the tulip bulb so said side faces the outside of the pot they're in.
Tulips will need 12 to 14 weeks of cold to force. They need a temperature of 35 to 45° during this time. You'd be best to lower garage temp 10°. Need to be in the dark for this to work. You'll need to periodically check for watering (maybe once a week); if dry, water. You could make the dark requirement by putting pots in a tote in the garage; if this method used, the pots will not dry out as much.
I think Emperor Mix may be Fosteriana tulips, if so, that's very good as Fosteriana are considered to be one of the best to force.
Hopefully the Holland's Best Tulip mix are Darwins, if so, they're usually good to force; if they're late singles, not so good.
Royal Prince mix - may be early single mix, if so, good; early single division are one of best to force.
When the tips are a couple of inches out of the soil and the roots fill the bottom (check the drain holes underneath) tulips are ready to exit cold period. At this point, introduce them to your garage plant lights and turn the temp back up to 50° in there.
You should be able to do the daffodils the same way though the daffodil bulb dimensions may preclude 5 to a 6" pot. I'd just use a bigger pot and fit them all in one pot.
The alliums, well, I'd wait till able to stick em in the ground somewhere. I've only been successful once forcing a big ball type allium (and that was an Allium karataviense).
Starting this late may have many, if not most, blooming at the same time as outside.
Best wishes on your endeavor.
Any thing else I can help with regarding your project, let me know?
@gardenglassgems