Storing fire doors until fitting

[redhexagonal]

I have a couple of solid core 44mm fire doors that won’t be fitted for a few months. One is finished and the other has a narrow glazed panel and hasnt been finished.

I did have them vertical leant against the wall for about a month, but I just read that can warp them. I don’t have room to lay them flat really, will it be ok to leave them on their long edge leaned against a wall? The room they are in is dry and a constant 14C roughly.

 

[redhexagonal]

Can anyone advise me on whether its ok to store these on the edge like this? I just put a straight edge on the long face of the finished door and it has a bow of up to about 3mm. Is that a lot?

 

[Wayners]

They lay flat in trade centres on racking but fine on side edge. Stand as vertical as you can against wall.
Stand a box against so they don't fall. Think you've done this already.
Maybe flip over every few weeks