I know my goats would not touch the hay once it was on the ground. Sheep may be the same way. Google "round bale hay feeders for sheep". Look at the ones that you could adapt to your skills and budget.
Example:
Store your hay off of the ground on pallets (no plywood) and stack the bales far enough apart to allow the air to circulate OR stack them flat end to flat end so tight that the water can not get between them.
As far as your feeding spot, I would always feed the bales on the same spot or get a pitch fork and stack the waste hay into a compost pile.
Example:
Store your hay off of the ground on pallets (no plywood) and stack the bales far enough apart to allow the air to circulate OR stack them flat end to flat end so tight that the water can not get between them.
As far as your feeding spot, I would always feed the bales on the same spot or get a pitch fork and stack the waste hay into a compost pile.