A multiplug extension is not going help. It is best to identify
what high powered devices are there. Fridge, TV,etc. These devices
are best served on a single socket that is controlled via the
circuit breakers.
The lower power devices still can use them. (PC, Micro Hi-Fi,
etc).
The problem comes when u mixed them. Personally encountered such
problems due to this on customer side and in office enviroment.
These people connect a PC next to 3 photocopiers and complain to us
that the PC acting strange, sometimes reboot by itself or moniter
keep flinkering. Once we moved the PC to a single socket, problem
solved.