Sounds like typical Iowa land,Ottumwa seems like their should be some timbers around there.I would say figure on using a lock on stand, most the trees have too many crotchs and forks for a climber to work very well.
A scouting trip will answer a lot of ??'s
Patchs of timber and fence lines running to them,scout out the water and food supply and
find their travel routes to the big timbers
and where trails cross.They will probaly use
the fencelines when the crops are all harvested,so you have to get a picture in your head of how it will look without the crops.When the corn is still in the whole country is one big timber of 8 ft. corn, they travel anywhere!! anytime!!
Watch for low spots in the fences,and steep
creek banks,etc. deer are basically lazy and take the path of least resistance.