Surge protection in Africa

[catpire]

I will be traveling to Zambia later this month and have a Z2 Auto Breas CPAP. The machine is rated for 110-240v input, but my RT said I should use a surge protector as well. The only surge protectors rated for 230v or above that I can find are big, industrial devices that aren't really practical for travel. I know the device will work with the local voltage, but does anyone have experience with using higher voltage surge protectors? And are they really necessary?