Vangellis

Has anyone installed a Smoke Cloak 4000 series horizontally (say in a ceiling void)? They are bug-ugly bits of kit and want to hide it as much as possible. Will obviously provide a cutout in the ceiling to let the 'fog' out..... Can the fluid still be seated upright in the device (when horizontal - to stop spillage), or should I opt for one of the 45 degree filler cap ones? Vangellis