Gardeners question time ether this week or last week said you can grow veg just about anywhere. We have a shaded yard and we did really well growing food this year. Lots of veg plants hate having to much sun, seedlings rely on warmth rather than light to germinate. I say you could pretty much stick the greenhouse anywhere and you would still get results.
Seeds need temps of around 5C for germination to take place.
I did a number of germination experiments a few weeks ago placing sweet pea seeds in several places around the college green house, I found that I got the best results on a heated propagation table that was about a meter high.
It's good practice when you get your greenhouse to find out what the optimum temperature is in each part of the greenhouse. You will usually find things grow really well when there between half a meter and a meter off the floor.
Hope this is of some help.