How to use placet with esse
I'm not sure why I'm getting stuck on this, but I'm writing something for my students, and I'm second guessing my phrasing. They have had a lot of exposure to the phrase "placet mihi" to mean "I like" (literally "it pleases me...). I know that you can use the infinitive with placere to express an action that pleases you (placet mihi cibum edere.) I also know that you can use a nominative to say a specific thing pleases me (cibus mihi placet).
Where I'm getting stuck, however, is with the verb "esse." I want to say "it pleases me to be useful." Would that be:
Placet mihi utili esse (utili being dative to go with mihi) (see 455.2.a)
Placet mihi utilem esse (utilem being accusative as part of an ACI as the subject) (see 455.2)
I'm thinking it should be dative since it would agree with the thing it's describing (mihi). Is that correct? This would mean it's the same as a previous question I asked. I'm guessing the accusative option would be "some other implied person being useful is pleasing to me."
I'm mostly looking for confirmation that I've finally internalized how this verb works.