Wow. Not sure I understand why professional security guards were needed. I realise our rest home is small, but we simply locked the doors, and put signs out saying nobody would be admitted. If a contractor had to come for an emergency such as plumbing/electrical, we escorted them in, checked that they had no known symptoms, ensured they sanitised their hands, and signed them in and out.
Why would anywhere need a major security presence if these measures were taken?