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You may need to find some floor or table lamps that will support grow bulbs. Your local garden nursery would be a good place to find out if there are other options that don't require a ceiling attachment.

Here's an article for you:
https://www.gardeningknowhow.com/houseplants/hpgen/what-are-grow-lights.htm

You have the newer fluorescent bulbs that put out less heat and can be placed close to the plants.

I don't know why you couldn't place them side by side. You can lower them as close as you need to for your plants' benefit.

https://www.gardeningknowhow.com/houseplants/hpgen/fluorescent-lighting-for-indoor-gardening.htm

https://www.gardeningknowhow.com/houseplants/hpgen/what-are-grow-lights.htm

https://www.gardeningknowhow.com/houseplants/hpgen/led-grow-light-information.htm

Sounds like you are off to a good start. Is there adequate warmth for the seeds to sprout? Did you cover the cups with saran wrap or a clear plastic cover to retain moisture till they sprout? Once they sprout, you can remove the cover. Water with a mister at first on the delicate sprouts.

Here is more info:

https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/when-to-start-seeds.htm

https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/leggy-seedling.htm

https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/cheap-seed-starting-how-to-germinate-seeds-at-home.htm

While grow lights are considered safe, since you will be around them for long periods, you can take precautions to protect yourself from overexposure to the blue light and UV rays. Wear grow glasses or sunglasses to protect against the UV rays. Hang lights about 8 feet off the ground and try to work three feet from any light source that contains UV rays. Keep your skin covered with long sleeve shirts, etc.

Any T5 flourescent fixture will be fine for succulents. Find one that covers the exact area that you intend to light. This article will help:

https://www.gardeningknowhow.com/houseplants/hpgen/fluorescent-lighting-for-indoor-gardening.htm

Poinsettias prefer bright, indirect light. If you put it near, but not right in front of, the west window it should be fine. Or, you can filter the light with a curtain. Rotate the plant 1/4 turn every week or so to balance the light it gets.

If a plant is put right in front of a west- or east-facing window, it will get direct sun.

https://www.gardeningknowhow.com/ornamental/flowers/poinsettia/poinsettia-care-how-do-you-take-care-of-poinsettias.htm