Man, you make it look so easy 
. It’s working so far.
No problems opening/editing .odt, .docx, .xlsx, .pptx
Document scrolling and rendering on big documents seems less fluid than in onlyoffice.
Browser zooming badly affects font rendering (at least on my PC).
To add support for spell-check you can add dictionaries (in this example for english language):
yum install collaboraoffice5.3-dict-en
systemctl restart loolwsd
(It’s OK to leave dictionaries out of the default installation, as they are said to consume some resources and users can choose which ones they want to install.)
With many open documents it warns about…
This is an unsupported version of LibreOffice Online. To avoid the impression that it is suitable for deployment in enterprises, this message appears when more than 10 documents or 20 connections are in use concurrently
Not really needed, but interesting to know tricks: