Your Bestag client advisor, as well as the three selected agents, will visit you individually. To ease your choice, you get :
On this solid basis, you choose your agent and define the sales strategy with the support of your Bestag client advisor (price, date and other sales specificities).
It's tempting to give the mandate to several agents in parallel. However, this drives them to push you to accept the first offer and/or to limit their effort, lest they lose all when another seals the deal.
Overly focusing at brokerage fees to choose an agent can be expensive. The final amount of the sale matters much more. Losing 50'000 francs on the sale price to save 10'000 francs in brokerage is not a good deal.