Temper operates throughout the Netherlands, so you can find a great shift almost anywhere. Please note that clients are mainly located in the big cities. If you live in a more sparsely populated area, it can be useful to expand your search area a bit to be sure you will find an interesting shift.
Especially in areas where fewer other FreeFlexers are active you can be even more entrepreneurial. Try to negotiate your rate or make arrangements with the client to make the job as attractive as possible for you.