I have not used Locative but do use OwnTracks.
OwnTracks is mostly reliable but I have found out that using two forms of tracking works better.
I use OwnTracks with an iBeacon and also use the Ping component and with both of these combined presence detection is very reliable so far.
To see how to combine two or more forms of Presence Detection see Presence detection with multiple devices & multiple trackers
This tracks our two Android phones and the iBeacon is located at the front door.