If you are dealing with a strangely shaped bulb species that doesn't seem to have a top or bottom, much less a point, just drop it into the hole and let it find its way. Bulbs planted upside down have the uncanny ability to right themselves. Purchase from reliable dealers to assure quality bulbs, which should be firm and heavy. Light-weight or softness could reflect disease or a loss of moisture. It should be free from gashes and cuts.
Bulbs have an outer layer called a tunic, very similar to an onion.
It's okay to buy bulbs with shattered and cracked tunics. It actually gives you a better look at the bulb. Some bulbs, like daffodils, may have bulblets attached to one side or another or even both sides. This is a good thing, a bonus. These are small bulbs that have grown out from the original bulb, they will mature and make more blooms.