This is an excellent article and a topic that Security Scotland have been involved in since August 2016 deploying matchday stewards to look after the safety of the 2,600 Celtic supporters housed in this area since the safe standing area opened.
Celtic piloted safe standing at the start of the 2016-17 season in the corner section between the Lisbon Lions and North stands, to much success.

They are the first senior club in Britain to do so, which, since it’s introduction, has seen every Premiership and Championship club in England visit the stadium to look at this section.
http://www.skysports.com/football/news/11669/11312487/liverpool-fans-back-celtics-safe-standing