Searching for good maternelle schools in Brussels

We are relocating to Brussels  next November for work and we are currently browsing the school options.

As per my understanding international schools are super expensive and only worth it if subsidised by ones employer.

Felsi network, is like montessory but i didnt find information on the registration process or the fees etc. Anyone knows? Is it recommended?

French speaking maternelle is my other option, which are free as inunderstand apart from small  fees like lunch and garderie. Any tips on good maternelle schools as regards teaching quality, reputation, facilities etc.?

We did nit find a house yet exactly because we would like to secure a good school for our children first and then find a house near by. We are considering quiet and safe areas like woluwe st lambert, auderghem, woluwe st pierre, merode/montgomerry, etterbeek. Are there any good maternelles in these areas tou would recommend?

Are there any maternelles i should consider apart from the public ones?