The only regulation I've seen regarding placement is that white lights to the front of a vehicle must not be fitted above a height of 1200mm above the ground when being used on the road. Fog lights or spot lights must be fitted in pairs, equally spaced from the centre line of the vehicle. So, four additional lights are acceptable. Front fog lamps should be mounted about 400mm from the outside edge of the vehicle. Roof mounted lights should only be used when off-road. Lights on agricultural vehicles are covered by different rules.
I've not found any regs about fog lights and driving or spot lights, other than the usual "should not cause dazzle to other road users", but by convention, fog lights are usually mounted low down below (or in) the front bumper to reduce reflected glare and spot lights usually above the bumper. A good rule of thumb might be to fit spot lights at the same height as the standard headlights.
I would also say that the connections to the fog lights would allow them to be used with dipped headlights and only in areas of reduced visibility, less than say, 100 metres. Spot or driving lights mounted above the bumper should only operate when the main beam headlights are illuminated and switched off automatically when driving on dipped headlights.
It might be a reasonable idea to also arrange that the spot or driving lights can be turned off altogether immaterial of whether the main beam headlights are illuminated or not, but that isn't a requirement.