No, you can't hide in plain sight just by saying so, even with a really high Stealth buffed by magic. Rule One of hiding in 5e:

1. If someone can see you, you can't attempt to hide from them.

You have find some where or some way of hiding before you can make the check to see if your hiding works. Hide first, roll the check second, always. For example (from the same link), you could all get down on the ground under your cloaks, and pretend to be lumps of rags. The goblins would see the rags, but they'd have to beat at least one of your party's stealth checks in order to notice that they don't belong there (and note that your DM might give the goblins Advantage if they're intimately familiar with this room and would usually notice something out of place).

So step one, find a hiding place. Do this like it makes sense in real life, using camo, breaking your outline, staying motionless deep in confusing shadows, getting up above the normal height people think to look at, etc. Make at least some minimal attempt to leverage that enhanced bonus. Then, and only then, can you roll your Stealth to see if you execute the method you thought up.

Now, the spell itself gives you some ideas for free, but you have to use them. Work those shadows, don't just stand around. Say how you're hiding, then find out if it worked.

No method, no Stealth check to see if the non-existent method works!

1. Yes, you would still take the Hide Action, as written. Even though your footsteps are silent, you would still make some other noise, such as your clothes rustling or the sound of your sword swinging. This would count as "any sound" by which to be tracked. (I wouldn't run it that way, but as written, I think that counts) I believe that the Hide Action would involve your character moving to some degree, and so should get advantage from the Boots of Elvenkind.

2. Part of 1

3. Even if they know your exact location, you are invisible. This means you're unseen, so you get the benefits of Unseen Attacker.