Can ABP Suite work with multiple database system and third party UI components?

[p3tero]

We plan to develop a web ERP software based on our existing desktop solution.
Main features:

• 1200+ entities and pages
• SaaS model
• .Net backend and Javascript UI
• multitenancy
• approx. 500 concurrent users
• authentication
• authorization system

We tried the trial version of the ABP Commercial framework, which can speed up the start of our development with a solid foundation and the UI and code generation functionality of the ABP Suite. We are about to buy a license, however, we did not have time to examine some problems during the trial period. I would like to ask for a little help with these, if anyone has experience with ABP.

• is it possible to replace one of the UI components generated by ABP Suite with a component produced by a third party (e.g. DevExpress, Telerik, Syncfusion) and from then on ABP Suite also uses it by default when creating a new CRUD page? Maybe with modifying some ABP Suite code templates?

• support of MSSQL and PostgreSQL (because our smaller clients would use PostgreSQL while our larger clients use MSSQL database). According to our idea, the DBMS the program should connect to would be decided at startup according to the value specified in the configuration (e.g. https://learn.microsoft.com/en-us/ef/core/managing-schemas/migrations/providers?tabs=dotnet-core-cli)
  Can ABP Suite somehow handle this during code generation? It is sufficient for us if ABP Suite generates the default MSSQL migration files and other necessary code from which we create the files required for PostgreSQL

• is there someone who has already developed a software of similar complexity based on the ABP Framework (ABP Commercial)?