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Please read the article linked to at the end of this response. Storing glads is easy and definitely worthwhile. After drying them, cut off the roots, remove the old corm and cormlets on the bottom but leave the onion skin covering if it is intact. I brush off clinging soil with an old, soft toothbrush. Shaking them in a bag with garden sulphur or other anti-fungal powder may protect them from fungal infection. I roll them in newspaper individually, place in a large grapefruit bag and hang them in the coolest spot in my basement. Cool and dry but above freezing are necessary conditions. Replant in spring after the soil warms. A bit of caution: glads produce many cormlets which easily break off and fall into the soil. If winter is mild, these will emerge in spring but take up to 2 years before large enough to bloom. Since I don't want dozens of these popping up in my garden, I'm very careful when I lift glads so as many remain attached as possible.

https://www.gardeningknowhow.com/ornamental/bulbs/gladiola/storing-gladiola-corms.htm

I would wait at least a month, so they can finish up their dormancy. Here is an article for more information: https://www.gardeningknowhow.com/ornamental/bulbs/gladiola/storing-gladiola-corms.htm

Gladiolus grow rather tall and can fall over (in my experience) For a more dramatic look, I would plant one in the center of each pot and plant supporting flowers around it. If you choose to plant them all in one pot, you may consider putting a support stick in the center to wrap a tie around to help keep them upright.

You are in zone 6b and you should lift your Gladiola corms each year.
Zones 7 and higher can leave them in the ground, but most gardeners actually lift the corms each year.

https://www.gardeningknowhow.com/ornamental/bulbs/gladiola/storing-gladiola-corms.htm

Gladiolas will bloom one time in a growing season.

https://www.gardeningknowhow.com/ornamental/bulbs/gladiola/care-of-gladiolas-how-to-grow-gladiolas-in-your-garden.htm

Sometimes moving the environment change too fast will cause this to happen. Usually, after flowering these will be on their way to dormancy to build up energy for the next flowering season. Can you provide a photo? This can help me to determine what went wrong.