but I would like it if there were some "easy way" to install rust-mode in emacs that covered rustfmt, RLS setup, and other configuration

At now I use:

flycheck-rust for online syntax checking
cargo for compiling, syntax checking and
and also it has great feature cargo-process-current-test if your cursor inside #[test]
you run this elisp function then emacs run cargo test arg to filter all tests except which one has cursor inside.
emacs-racer for obvious reasons
rust-playground for fast way to check some
syntax construction (running snippet with ctrl+enter is great)
and rust-mode of course

I do not use rls via emacs-lsp, because of completetions work too slow in compare with emacs-racer.

Bad things that these are separate tools, and some times it conflict with each other,
for example if you change code and run cargo build with active flycheck-mode, then
one of two operations: syntax check or cargo build hangs with message like this Blocking waiting for file lock on build directory.

It would be great to combine this tools on basis of some emacs ide framework, like
http://cedet.sourceforge.net/ede.shtml (which is part of emacs 25 as I know).