I have 3 listings and use Lodgify as the Channel Manager. It does seem a bit overkill for 'only' 3 listings, but it eliminates double bookings, I get my own website and it integrates well with pricelabs for dynamic pricing (another thing I highly recommend!).
The only issue I have with Lodgify is that the Devs are quite slow to update their software when there's an AirBnB update. AirBnB released the pet fee in November? and Lodgify won't be integrating with that until later this month. So basically if you're using Lodgify, you couldn't take advantage of this feature for 3 months after AirBnB added. That's far too slow.