If the kennel is right next to the house, and the bodies were left in plain sight between the house and the kennel, that seems bold.
That means that there was no attempt to delay discovery of the bodies, or to buy time for the shooter to getaway? If there's one thing I've come to expect after reading about murders like this, it is that murderers usually factor in maximizing getaway time - where possible.
Since his wife and son were marched out of the house to a location where they were shot, why next to the driveway? Why not some distance away in the trees? Why not delay the discovery of the bodies? Why wasn't Alex concerned that the shooter was still in the house?