You'd need to either rename your release binaries to something https://github.com/cargo-bins/cargo-binstall understands by default or (probably better) add some metadata to Cargo.toml similarly to blacknon/hwatch#135.
Fortunately, redu doesn't take that long to compile, but many rust programs do, so I hesitated before running plain cargo install.
P.S. Thank you for the nice tool!