Is it necessary to connect the land behind the dress to the land on the DEV Board?

[Rumpel5]

1. Is it necessary to connect the central ground contact ESP32-WROOM32U to the board GND? it may be enough to apply thermal paste
2. Is it necessary to connect all the GND pins ESP32-WROOM32U to the ground on the board or is it enough to connect only one?
3. Is it necessary to put power capacitors next to the VCC pin ESP32-WROOM32U or are there enough capacitors that stand on DC-DC the converter that powers it?
thank you in advance!