Nesting boxes side house

Considering adding 1 or 2 nesting boxes to the shaded out of the weather side of our house.
Not sure what to go for or even if it's a good idea am thinking larger amounts of bird poo in our small back garden.
Can I add 2 boxes to a small space?
Should they be different to attract different species (is territory an issue)?
Should I be looking for anything in terms of wood treatment, quality etc?
Not sure what to go for or even if it's a good idea am thinking larger amounts of bird poo in our small back garden.
Can I add 2 boxes to a small space?
Should they be different to attract different species (is territory an issue)?
Should I be looking for anything in terms of wood treatment, quality etc?
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
The box on the wall was positioned there after wrens nested in the adjacent garden hose tidy. We had to buy a replacement hose that year because we couldn’t use the original one until the chicks had fledged!
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I live in west central Scotland - not where that photo is...