OK...no, having the already-cased synths in the Eurorack case is a BAD idea. For one thing, it's incredibly wasteful. So, let's look at your case for a second, which is apparently a 4-row Doepfer "Monster".
That case has 672 hp available, and it's already powered. Street price on it at present = $1849. 1849/672=$2.75 (approximately) is the cost per hp for housing something in there.
You have 330 hp of this covered by synths that HAVE cases and HAVE power already. That 330 hp = $907.50. This is how much it costs YOU to house them there. So, break that six ways, and this means you've effectively added just over $150 to the cost of each one of those by doing this.
Yes, I get it...this is for convenience, etc. But there's definitely better ways to do this, such as a triple-tier Moog stand for those alone. By avoiding this, you're also keeping space open for devices that don't have power or cases already...such as the vast majority of Eurorack modules.