By Frank Dalleres Liverpool manager Arne Slot enjoyed the best win of his fledgling Anfield career on Sunday when his team cruised to a 3-0 win at Manchester United. Luis Diaz scored twice in the first half and Mohamed Salah continued his prolific record at Old Trafford by adding the third as Liverpool joined Manchester City on maximum points. Slot’s Liverpool are yet to concede in his first three games but they had to weather heavy pressure from United in the opening stages before exerting control. Diaz headed them in front when he beat teammate Dominik Szoboszlai to Salah’s cross and then do…