It looks like all the countries in group E may not really qualified for the next round because if you check their upcoming matches you will see that the matches are going to be more tougher than anything they have ever seen on the group stage so they all need to buckle up their game because Belgium will be meeting France, Romania will be meeting Netherlands while Slovakia will be meeting England, so you can see that is a very tough matches for the clubs in group E.
In terms of Slovakia match with England I may not no what the exact results will be but without being told we no that right from there history of football England is always higher in performance than Slovakia because of the quality players they possess, though England has not really been themselves this season because they seem to have been struggling during there group stage but however there is a big difference between group stage and round of 16, so they will use all they have to win the match.
Here I agree about the possible exit of all group E teams from the event as they are having the toughest matches ahead waiting for them and their performance in early round matches are not good enough to give them any advantage for the having any chance against these teams for the win and having spot into quarterfinals.
Even Netherlands is having not good performance in this tense game they can pass Romania for having spot into quarterfinal of the event with all group D teams are having good chance of going into next round with their performance and quality is much better but still we have to wait for the start of these matches because in this year we have many surprises in few matches and things can go for more surprises as all teams are having their best squads for win their matches and having good end of their campaign.