carbon intake......

Just fitting the carbon intake to repalce the top front left hand grille for a better cold air feed and just wondered if anyone knew the best way to secure the intake? I have read some threads about fixing it in with body sealant and also cable ties but after placing it in the cut out i cant see how much of the carbon intake comes into contact with the bumper to give a secure fixing with sealant and also how to fix cable ties to anywhere? Suggestions anyone?????
 
i just ran a beed of sealant round the grille and slid it in the bumper then used masking tape to hold it, left the tape on for 24hrs and nowits going no where.