A new greenhouse only for 3 tomato plants? Is it a joke?  Consider to put at least 4 plants located in 4 corners 
In my experience you can grow almost any tomato variety indoor but ultra-early types which like moderate temperatures and give you only several clusters even in greenhouse conditions. They are just not worth to be grown in greenhouse and with so limited total amount of plants. Choose any indeterminate productive varieties with a good taste... I can recommend hundreds of such tomato varieties from my part of the world, but let American gardeners from the South suggest you some... 
And I know that Michael will be very happy if you choose any dwarfs like he does
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1 kg=2.2 lb , 1 m=39,37 in , 1 oz=28.35 g , 1 ft=30.48 cm , 1 lb= 0,4536 kg , 1 in=2.54 cm , 1 l = 0.26 gallon , 0 C=32 F
Andrey a.k.a. TOMATODOR
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