If you've got rats in your area, well aren't they everywhere there's a sewer system and urbanisation.
Ultrasonic emitters are cheap from garden stores nowadays and they work well, they can breed Resistance to toxins but can't breed out their cyclic range in hearing.
Once you've got a decent looking compost after a couple of months, adding Humate liquor really enriches it by accelerating Humic breakdown/biodegradation and so increasing the available nutrient composition in the organic matter bulk and increasing the amounts of Humic acids as well as specifically, Fulvic acid.
Not necessary but will really enrich a medium.
Same can be done to re-energise recycled composts and enrich cheap growbag composts etc, add solution and let mature for a month or two, turning or agitating once a week or two, really does the trick for nice rich medium from growbag compost or spent and recycled, you can add spent compost to your organic bulk pile as well, it all breaks down.
There's a few brands which have been used in conventional gardening for donkeys years, like Humax, but Grandma Enggys does a canna product, H2 Extra Pure, which i started using and is good stuff, 5Ml per litre is used for when irrigating plants but i use 10Ml and a tablespoon of Molasses to a litre and add that to 60-80litres of compost and fantastic addition to ones own compost, recycled compost or making cheap much better, money well spent because Humates really give plants health and vigour, that's well known.
Look into Humates/Humic acid matey, very interesting stuff.
[You can even make Humate liquor yourself, plenty of info out there.]
Paxus.