Well I am definitely no expert ( I'm sure one will be along soon) but as long as they are not being kept restricted and that there is adequate space to allow ventilation ,then I can't honestly see a problem @P A U L
You can put all of them in a big container, or leave them close together. They will love it, and then just divide them up as they over crowd. They like a northern window and also love low light. Fertilize to keep green, and then use a fertilizer for flowers...one with more Phosphorous. This is a great house plant and one I highly suggest.