Yes they can offer a base in June. The biddings are close by then. Results are given beginning of August but that does not mean they know the results already. For winter in Spain most likely but not 100% sure it would be a base in the Canaries.
Summer in mainland.
All bases are growing so most likely The summer base can become the permanent base if you wish so.
All the people I work with that are ex FR say no way in hell they return there.
Of course is always a personal choice.